I’m a little late to the party but I think that red dot type pistol optics are a real trend that will continue to snowball as newer shooters without decades of old iron sight habits use them. A situation similar to scopes on hunting rifles in the 1950s and into the ‘60s.
Personally, I really like red dots on my pistols. I understand that guys of my generation and older (in otherwords - us old guys) have difficulty finding the dot. It is a training issue, just like using irons properly is. I have paid attention to training techniques and have done lots of dry fire practice since I put the first one on my Buck Mark .22 pistol as a trial. And I’ve gotten reasonably fast with them and pick up the red dot naturally anymore. I don’t know if I’m faster for the first shot, but I think I’m faster for follow-up shots, or shots on other targets. I took a defensive pistol course as the acid test for using a RDS and came away feeling that I had done better than I ever had before. In fact I seemed to be shooting faster, especially for pairs, than most of the class. And it seemed easy to do. But it took some practice to get there.
I think that, especially with older eyes, the fact that you only have to focus on the dot which is on the same focal plane as the target is easier.
I also think that accuracy is better, especially at longer distances. I know the RDS on the Buck Mark more than doubled my hit ration on ground squirrels. I have missed more than a few varmints with irons in the past when the range got just a bit long, so I’m glad to have the help of an RDS to place my shots more accurately. That is one reason why the big 10mm pistol of mine has a RDS.
Another reason is for low-light shooting. Not very common, but if you’ve gotta do it, an illuminated dot is way better than something like tritium sights.
I’ve got a couple of friends who are experienced shooters who can’t find the dot. Strangely, I have a couple of other novice shooter friends who have pretty much started with the dot due to their eyesight or some other reason, and they picked it right up naturally. No prior habits to break, I assume.
I’m glad that pistols are coming more and more with the OPTION to use RDS. Options are good. Like I said, I think the time will come when the majority of pistol shooters will be using RDS. The time has long past for it to be a fad. I’m glad I’ve given them a try. They make me a better shooter as far as I’m concerned. 3 out of my last 4 pistols have either come optics-ready, or I had the slide milled for a RDS. The 4th was my SIG P365 EDC pistol, and for close distances that it will likely be used at, the RDS isn’t necessary. But when I was shooting at a skunk about 30 yards away, I can’t help but think if it had worn a RDS, I would have hit it!

Clockwise from upper left: CZ P10 C/Trijicon RMR - Browning Buck Mark/Vortex Viper - CZ P10 F/Holosun 507 C ACSS - SA XDM-10/Holosun 507 C